51756164365 has 4 divisors (see below), whose sum is σ = 62107397244. Its totient is φ = 41404931488.

The previous prime is 51756164353. The next prime is 51756164387. The reversal of 51756164365 is 56346165715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35294761161 + 16461403204 = 187869^2 + 128302^2 .

It is a cyclic number.

It is not a de Polignac number, because 51756164365 - 2⁵ = 51756164333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5175616432 + ... + 5175616441.

It is an arithmetic number, because the mean of its divisors is an integer number (15526849311).

Almost surely, 2^51756164365 is an apocalyptic number.

It is an amenable number.

51756164365 is a deficient number, since it is larger than the sum of its proper divisors (10351232879).

51756164365 is a wasteful number, since it uses less digits than its factorization.

51756164365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10351232878.

The product of its digits is 2268000, while the sum is 49.

The spelling of 51756164365 in words is "fifty-one billion, seven hundred fifty-six million, one hundred sixty-four thousand, three hundred sixty-five".